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Girls in Math at Yale 2021 Problem 2: berry good!

Source:

February 27, 2021
Yalecollege

Problem Statement

A box of strawberries, containing 1212 strawberries total, costs $2\$ 2. A box of blueberries, containing 4848 blueberries total, costs $3 \$ 3. Suppose that for $12\$ 12, Sareen can either buy mm strawberries total or nn blueberries total. Find nāˆ’mn - m.
Proposed by Andrew Wu